---
title: "Neural Plate | Intro to Brain and Behavior"
description: "Neural plate is the thickened ectoderm that becomes the neural tube, the first visible step in nervous system development in Intro to Brain and Behavior."
canonical: "https://fiveable.me/introduction-brain-behavior/key-terms/neural-plate"
type: "key-term"
subject: "Intro to Brain and Behavior"
unit: "Unit 6"
---

# Neural Plate | Intro to Brain and Behavior

## Definition

The neural plate is a thickened region of ectoderm that appears early in embryonic development and folds into the neural tube. In Intro to Brain and Behavior, it is the starting point for how the brain and spinal cord form.

## What It Is

The neural plate is the first visible sheet of nervous system tissue in early embryonic development. In Intro to Brain and Behavior, you can think of it as the embryo’s “starter material” for the central nervous system, because this flattened patch of ectoderm is what will eventually become the brain and spinal cord.

It forms during neural induction, when signals from nearby mesoderm tell part of the ectoderm not to become skin. Instead, that patch thickens and changes shape into neural tissue. This shift matters because ectoderm is the embryo’s outer layer, and without the right signals, it would default toward a non-neural fate.

The neural plate does not stay flat for long. As neurulation begins, its edges lift upward to form neural folds, and the middle region becomes the neural groove. Those folds then move toward each other and fuse, creating the neural tube. That tube is the structure that later differentiates into the brain and spinal cord.

A useful way to picture it is as a construction sequence: ectoderm is the raw sheet, the neural plate is the specialized section, and the neural tube is the closed structure that sets up the central nervous system. The neural plate sits right in the middle of that process, so if something goes wrong here, the later steps cannot happen normally.

This is why the neural plate is usually discussed with neural induction, not as a separate isolated object. Signals such as noggin and chordin help push the ectoderm toward a neural identity, and the neural plate is the visible result of that signaling. Around the third week of development, this transition is already underway, which is why it shows up so early in brain development lessons.

One common mistake is thinking the neural plate is the final nervous system structure. It is not. It is an early embryonic stage that exists briefly before folding and closure, but that brief stage is where the basic plan for the entire central nervous system gets started.

## Why It Matters

The neural plate matters because it is the moment when the nervous system starts to become anatomically real instead of just a developmental possibility. If you are tracing how the brain and spinal cord form, this is the first step that tells you where neural tissue is coming from and how the embryo decides that tissue will not become skin.

In Intro to Brain and Behavior, this term connects cell signaling, embryology, and later brain structure. Once you understand the neural plate, it becomes easier to follow the next steps in neurulation, the formation of the neural tube, and the origin of major central nervous system structures. That sequence shows up again when you study developmental disorders, because defects in plate formation or tube closure can lead to spina bifida or anencephaly.

It also gives you a clean way to think about causation in brain development: signals from one tissue region change the fate of another tissue region, and that fate change creates a new structure with a different future. That idea shows up all over neuroscience, from early development to plasticity and repair, so the neural plate is a good place to practice that way of thinking.

## Connections

### ectoderm

The neural plate comes from ectoderm, which is the embryo’s outer layer. In normal development, ectoderm can become skin or neural tissue depending on the signals it receives. The neural plate is the ectodermal region that has been told to take the neural path, so this term helps you see where the tissue starts before it becomes nervous system tissue.

### neurulation

Neurulation is the larger process that includes neural plate formation, folding, and closure. The neural plate is one step inside that sequence, not the whole process. If you are asked to trace development in order, neurulation is the umbrella term, and the neural plate is the early flattened stage that begins the fold into the neural tube.

### [neural tube](/introduction-brain-behavior/key-terms/neural-tube)

The neural tube is what the neural plate becomes after the edges fold together and fuse. This is the structure that later develops into the brain and spinal cord. When you compare the two, the neural plate is the open, thickened sheet, while the neural tube is the closed early nervous system structure.

### [spina bifida](/introduction-brain-behavior/key-terms/spina-bifida)

Spina bifida is one of the developmental problems that can happen if neurulation does not finish correctly. If the neural plate does not fold and close as it should, the neural tube may not seal properly along the dorsal midline. That makes spina bifida a useful example of why the neural plate stage matters in real development.

## On the AP Exam

A quiz item or short answer often asks you to identify the neural plate in a development diagram, put it in the correct sequence, or explain what tissue it comes from and what it becomes. You might also see a question that describes a failure in neural tube closure and asks which earlier structure was involved. In those cases, you want to trace the pathway: ectoderm becomes neural plate, the plate folds during neurulation, and the neural tube forms the future brain and spinal cord.

If your class uses case examples of congenital disorders, the neural plate is the starting point for explaining why defects in early embryonic development can have major nervous system effects. A strong answer usually names the process, the tissue, and the outcome instead of just defining the term in isolation.

## neural plate vs neural tube

The neural plate is the thickened sheet of ectoderm before folding, while the neural tube is the closed structure formed after the edges fuse. If you mix them up, remember that the plate comes first and the tube comes after neurulation. The plate is the starting shape, and the tube is the finished early nervous system structure.

## Key Takeaways

- The neural plate is a thickened region of ectoderm that begins the formation of the central nervous system.
- It appears during neural induction, when signals from nearby mesoderm push ectoderm away from a skin fate and toward neural tissue.
- The neural plate folds during neurulation to form the neural tube, which later develops into the brain and spinal cord.
- Problems with neural plate formation or neurulation can lead to congenital conditions such as spina bifida or anencephaly.
- If you are tracing embryonic development, the neural plate is the early stage that connects tissue signaling to later brain anatomy.

## FAQs

### What is neural plate in Intro to Brain and Behavior?

The neural plate is a thickened area of ectoderm that forms early in embryonic development and becomes the neural tube. In Intro to Brain and Behavior, it is the first visible sign that the nervous system is being built. It sits at the start of the process that produces the brain and spinal cord.

### How is the neural plate different from the neural tube?

The neural plate is the flattened, early embryonic tissue before closure. The neural tube is the structure that forms after the plate folds inward and the edges fuse. If you are studying the sequence, the plate comes first and the tube is the result of neurulation.

### What causes the neural plate to form?

Neural induction causes the neural plate to form. Signals from the underlying mesoderm, including molecules like noggin and chordin, tell a region of ectoderm to become neural tissue instead of skin. That signaling changes the fate of the cells and starts the nervous system developmental pathway.

### Why does the neural plate matter for birth defects?

If the neural plate does not form or fold correctly, the neural tube may not close normally. That can lead to neural tube defects such as spina bifida or anencephaly. This is why early embryonic development matters so much when you study disorders of the nervous system.

## Related Study Guides

- [6.1 Neural induction and neurulation](/introduction-brain-behavior/unit-6/neural-induction-neurulation/study-guide/JJyt8ljXQKn35nwf)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
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